CONTENTS. 



CHAPTER I. 



INTRODUCTORY. 



A sea-side sketch. The calm. The storm. Changing aspects 

 of the sea. Use of storms. Application of the facts ob- 

 servable in Nature. Form of aquarium. Artificial rock- 

 work. Floor of the tank. Pestiferous deposit. Natural 

 sea- water. Artificial sea- water how prepared for the 

 aquarium by Mr. Gosse. Proportions recommended by 

 Mr. Warington. Salts procured by evaporation. Specific 

 gravity of sea-water. Vegetation proper for the tank. 

 Mr. Warington's coloured media. Vegetation not always 

 essential. Scavenger department. Overcrowding to be 

 avoided. Assortment of specimens. Management of light 

 and temperature. Precautions to be observed. Artificial 

 aeration of the water p. 1-27 



CHAPTER II. 



SPONGES. 



Their forms and habitat. Currents observable in the living 

 Sponge. Propagation of Sponges. Distribution of their 

 progeny. Ciliary action. Gemmules of the Sponge, p. 28-37 



CHAPTER, m. 



FORAMINIFERA. 



Their general appearance. Organization of Foraminifera. 

 Their numerical importance p. 38-42 



